Nat o Pat

[Mauricio-Pacman]

How can I make a local ip go out to the internet with the ip of my wan interface?. In the nat options that I can see through the web administration, I can't find how to configure it, since this public ip is the one with the wan interface

[ww]

You dont have to configure this. All traffic by default will use the wan ip 

https://documentation.meraki.com/MX/Networks_and_Routing/MX_Addressing_and_VLANs#Routed_Mode

[Mauricio-Pacman]

Yes, I want my telephone plant to register with the sip trunk of my provider, to do it with the public IP that my WAN interface has and not with the IP of my local network.

I don't know if I'm making myself understand. 

Thank you in advance for your help.